Is there any way to gauge the number of Planck units believed to make up the universe?

Question

...and if so, and we stretched them end-to-end, is there any way to define how long the string of them would be?

Just a bit of numeric, theoretical-physics-based whimsy. :-)

Answer 1

The String would be= 3.430325053 x 10^75 milimeters long. This would mean that the Universe is made up of a very long string. This string would then be cut into smaller pieces making up one basic Unit String.This is what String Theory implies. And every basic string would be have a quantum energy when in motion.
This is another way to conceive the Universe beside that of General relativity theory.
Very inovative enquiry.very good.

Answer 2

Excellent question.... And, I would bet that the number would be rising every moment.

I don't know.